Lindane-induced modifications to membrane lipid structure: Effect on membrane fluidity after subchronic treament

1992 ◽  
Vol 12 (4) ◽  
pp. 303-311 ◽  
Author(s):  
M. T. Gutierrez-Ocaña ◽  
S. Senar ◽  
M. A. Perez-Albarsanz ◽  
M. N. Recio
Keyword(s):  
Membrane Fluidity ◽  
Phospholipid Composition ◽  
Membrane Lipid ◽  
Ventral Prostate ◽  
Lipid Structure ◽  
Rat Ventral Prostate ◽  
Polarization Technique ◽  
Lipid Pattern ◽  
Altered Lipid

Chronic lindane intoxication by injecting subcutaneously the toxicant, resulted in an altered lipid pattern in rat ventral prostate membranes. An increase of membrane fluidity was also observed using a fluorescence polarization technique. When in vitro experiments were carried out with both treated and untreated rats, an interesting lack of parallelism was found, which could indicate the development of a resistance to membrane disordering by lindane. The observed changes in cholesterol and phospholipid composition are also consistent with the hypothesis that lindane perturbs the lipid matrix of membranes, possibly inducing complex compensatory changes in the membrane lipid composition.

FURTHER STUDIES ON A SOLUBLE ANDROGEN-MACROMOLECULAR COMPLEX FROM THE RAT VENTRAL PROSTATE

1970 ◽  
Vol 65 (3) ◽  
pp. 517-524 ◽  
Author(s):  
Olav Unhjem
Keyword(s):  
Hydrogen Atom ◽  
Keto Group ◽  
Ventral Prostate ◽  
Metabolic Inhibitors ◽  
Macromolecular Complex ◽  
Structural Requirements ◽  
Macromolecular Complexes ◽  
Rat Ventral Prostate

ABSTRACT The ability of various steroids and metabolic inhibitors to influence the binding of androgen to soluble macromolecules in the rat ventral prostate was evaluated in vitro. The results obtained revealed some structural requirements of steroids for binding to the macromolecules. An androstane skeleton with the α-configuration of the hydrogen atom at position 5 seemed to be essential for binding as well as a keto group at position 3. N-ethylmaleimide, Na-iodoacetate and p-hydroxymercuribenzoate inhibited the binding of androgen to macromolecules. The androgen-macromolecular complexes appeared to be rather stable at temperatures below 5°C.

scholarly journals Incorporation of Testosterone and 5α-Dihydrotestosterone into Rat Ventral Prostate in vitro

1970 ◽  
Vol 17 (6) ◽  
pp. 453-458 ◽  
Author(s):  
JUN SHIMAZAKI ◽  
JIN SATO ◽  
HISAKO NAGAI ◽  
KEIZO SHIDA
Keyword(s):  
Ventral Prostate ◽  
Rat Ventral Prostate

Cell surface modifications in the epithelium of rat ventral prostate during adaptation to in vitro conditions: An ultrastructural study

In Vitro ◽  
1984 ◽  
Vol 20 (3) ◽  
pp. 216-228 ◽  
Author(s):  
Frederick B. Merk ◽  
Paul W. L. Kwan ◽  
Stanley Spilman ◽  
Louis Terracio ◽  
William H. J. Douglas
Keyword(s):  
Cell Surface ◽  
Ultrastructural Study ◽  
Surface Modifications ◽  
Ventral Prostate ◽  
Rat Ventral Prostate

Effects of membrane lipid and fluidity modifications on HIV-1 infectibility of primate lymphocytes in vitro

1990 ◽  
Vol 10 (3) ◽  
pp. 263-270 ◽  
Author(s):  
J. Pascal Zimmer ◽  
Hans A. Lehr ◽  
Christoph Hübner ◽  
Stephan G. Lindner ◽  
Ralf Ramsperger ◽  
...  
Keyword(s):  
Plasma Membrane ◽  
Membrane Fluidity ◽  
Lipid Composition ◽  
Membrane Lipid ◽  
Serum Factors ◽  
Membrane Lipid Composition ◽  
Plasma Membrane Lipid ◽  
Hiv 1

Although most non-human primates, except the chimpanzee and the gibbon in vivo are not infectible by HIV-1, lymphocytes of several of these species can be infected by HIV-1 in vitro.In order to investigate whether the in vitro infectibility of primate lymphocytes might be attributed to plasma membrane adaptation processes or to serum factors, we compared HIV-1 infectibility of cultivated peripheral blood lymphocytes of macaques and of baboons on day one and on day ten of cultivation. These data were correlated to plasma membrane lipid composition and membrane fluidity.We found a correlation between increased HIV-1 in vitro infectibility and changes in plasma membrane lipid composition resulting in decreased membrane fluidity of cultured primate lymphocytes.

BINDING OF ANDROGEN TO COMPONENTS OF RAT VENTRAL PROSTATE NUCLEI IN VITRO

1970 ◽  
Vol 63 (1) ◽  
pp. 69-78 ◽  
Author(s):  
Olav Unhjem
Keyword(s):  
Sodium Chloride ◽  
Radioactive Material ◽  
Ventral Prostate ◽  
Major Portion ◽  
Nuclear Chromatin ◽  
Rat Ventral Prostate

ABSTRACT Following incubation of rat ventral prostate slices with [1,2-3H]testosterone in vitro, radioactive material is found to be associated with the nuclei. Sodium chloride extraction of the nuclei removes macromolecules which might at least partially be responsible for this association. These macromolecules are probably components of the nuclear chromatin. Analyses of the radioactive material indicate that the major portion consists of dihydrotestosterone* and to a lesser extent of testosterone. All the radioactive material is linked non-covalently to the nuclear components responsible for the association.

scholarly journals Steroid-sensitive gene-1 is an androgen-regulated gene expressed in prostatic smooth muscle cells in vivo

2001 ◽  
Vol 26 (3) ◽  
pp. 175-184 ◽  
Author(s):  
D Marcantonio ◽  
LE Chalifour ◽  
MA Alaoui-Jamali And H T Huynh ◽  
MA Alaoui-Jamali ◽  
MA Alaoui-Jamali ◽  
...  
Keyword(s):  
Smooth Muscle ◽  
Smooth Muscle Cells ◽  
Mrna Expression ◽  
Muscle Cells ◽  
Ventral Prostate ◽  
Mrna Levels ◽  
Rat Ventral Prostate ◽  
Steroid Sensitive

Steroid-sensitive gene-1 (SSG1) is a novel gene we cloned, found regulated by 17beta-estradiol in the rat uterus and mammary gland, and over-expressed in 7,12-dimethylbenz(a)anthracene-induced rat mammary tumors. We show here that SSG1 mRNA and protein expression are regulated by androgens in the rat ventral prostate. Increases in SSG1 mRNA levels were detected by Northern blotting after 24 h and reached a 27-fold peak 96 h following castration, relative to SSG1 mRNA expression in sham-operated rats. Dihydrotestosterone or testosterone supplementation of castrated rats prevented this rise in SSG1 mRNA. In contrast with SSG1 mRNA expression, SSG1 protein was decreased 16-fold 2 weeks following castration but was at control levels in the prostates of castrated rats receiving dihydrotestosterone or testosterone. Although SSG1 is regulated by androgens in vivo, treatment of LnCap cells with dihydrotestosterone, cyproterone acetate or flutamide did not result in the regulation of SSG1 protein levels in vitro. Immunofluorescence studies show that SSG1 is mainly expressed in prostatic smooth muscle cells. These results indicate that SSG1 is an androgen-regulated gene that is expressed in the smooth muscle component of the rat ventral prostate in vivo.

scholarly journals Membrane Sphingolipid-Ergosterol Interactions Are Important Determinants of Multidrug Resistance in Candida albicans

2004 ◽  
Vol 48 (5) ◽  
pp. 1778-1787 ◽  
Author(s):  
Kasturi Mukhopadhyay ◽  
Tulika Prasad ◽  
Preeti Saini ◽  
Thomas J. Pucadyil ◽  
Amitabha Chattopadhyay ◽  
...  
Keyword(s):  
Candida Albicans ◽  
Membrane Fluidity ◽  
Fluorescent Protein ◽  
Efflux Pump ◽  
Membrane Lipid ◽  
Ergosterol Biosynthesis ◽  
Fourfold Increase ◽  
Surface Localization ◽  
Mutant Cells

ABSTRACT In this study, we examined the importance of membrane ergosterol and sphingolipids in the drug susceptibilities of Candida albicans. We used three independent methods to test the drug susceptibilities of erg mutant cells, which were defective in ergosterol biosynthesis. While spot and filter disk assays revealed that erg2 and erg16 mutant cells of C. albicans became hypersensitive to almost all of the drugs tested (i.e., 4-nitroquinoline oxide, terbinafine, o-phenanthroline, itraconazole, and ketoconazole), determination of the MIC at which 80% of the cells were inhibited revealed more than fourfold increase in susceptibility to ketoconazole and terbinafine. Treatment of wild-type C. albicans cells with fumonisin B1 resulted in 45% inhibition of sphingolipid biosynthesis and caused cells to become hypersensitive to the above drugs. Although erg mutants displayed enhanced membrane fluidity and passive diffusion, these changes alone were not sufficient to elicit the observed hypersusceptibility phenotype of erg mutants. For example, the induction in vitro of a 12% change in the membrane fluidity of C. albicans cells by a membrane fluidizer, benzyl alcohol, did not affect the drug susceptibilities of Candida cells. Additionally, the surface localization of green fluorescent protein-tagged Cdr1p, a major drug efflux pump protein of C. albicans, revealed that any disruption in ergosterol and sphingolipid interactions also interfered with its proper surface localization and functioning. A 50% reduction in the efflux of the Cdr1p substrate, rhodamine 6G, in erg mutant cells or in cells with a reduced sphingolipid content suggested a strong correlation between these membrane lipid components and this major efflux pump protein. Taken together, the results of our study demonstrate for the first time that there is an interaction between membrane ergosterol and sphingolipids, that a reduction in the content of either of these two components results in a disruption of this interaction, and that this disruption has deleterious effects on the drug susceptibilities of C. albicans cells.

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